Scale Model Shop

Collapse

Los's 1/35 Trumpeter Sd.Kfz 7 KM m11

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Panzerwrecker
    • Mar 2022
    • 578
    • Los
    • Wales, UK

    #31
    A few unexpected hours in the cave last night had me completing a few more steps.

    Step 9 has you build up the steering box, shaft, and wheel. The instructions have you attach the wheel to the shaft and then the shaft to the chassis. I would recommend NOT attaching it to the chassis just yet. You still must add wheels and tracks, turn it upside down to add the exhaust etc before then, so it is asking for trouble to add it in this step. This part attachment is also relevant depending on whether you prefer to add the bodywork to the chassis before or after painting. The instructions have you add the bodywork in step 17 so if you go down this route, add both in step 18 BEFORE the firewall (part WD12) goes in. If you want to keep both chassis and bodywork separate then keep both shaft and steering wheel loose until you do finally add the bodywork to the chassis.

    Steering shaft and wheel alongside the idler axle assemblies
    Click image for larger version

Name:	20220926_203348.jpg
Views:	1
Size:	2.4 KB
ID:	1185238

    The track wheel axles (parts B29) do not need to be glued in. They are a smooth friction fit even after ridding them of mould seams and give the bonus of articulating all the wheels if you wish. They most definitely won’t fall out so no real need to glue unless you must.

    Click image for larger version

Name:	20220926_203152.jpg
Views:	1
Size:	4.2 KB
ID:	1185239

    The front axle and steering are constructed in step 10 and here you are instructed not to cement the hubs to the axle beam. Having the wheels free to steer is a nice option. However, the steering linkages do not all rotate UNLESS you pin them. To have a ‘working system’ requires a whole bunch of extra work. Unlike many other kits you do at least get the option to position them in a turned position without too much extra work. Take note though. If you do decide to turn them, this impacts the layout of other steering linkages in step 11.

    The process of fitting them is a little tricky as in effect you must line up the holes in both part D19 (D20) and B45 before dropping the pin (B33) in to secure. The tolerances are way too tight IMO so to avoid snapping the pin whilst inserting I would recommend opening the holes in all four parts with a micro drill and making sure the shaft of the pin (B33) is sanded smooth.

    Click image for larger version

Name:	20220926_203231.jpg
Views:	1
Size:	3.9 KB
ID:	1185243

    Click image for larger version

Name:	20220926_203241.jpg
Views:	1
Size:	3.5 KB
ID:	1185244

    Unfortunately, once built up the hubs are extremely ‘wobbly’! If left this way, both wheels will ‘splay out’ under the weight of the model. There are two ways of correcting this. The first is to simply glue parts D17, D20 and B45 in place once you are happy with the wheel direction, or a thin plastic card shim can be added and drilled to parts B45.

    As for the steering linkages there is a diagram in step 11 to show how the steering box linkages attach to both the steering box and the steering rod connecting the driver’s side hub knuckle. This diagram shows the wheels in the straight-ahead position. If you turn the wheels this obviously effects the layout. Confusingly, compared to the arrowed connection drawing of the built-up linkage assembly next to the chassis, the construction stage drawing is drawn upside down!

    Click image for larger version

Name:	20220926_203806.jpg
Views:	1
Size:	4.6 KB
ID:	1185241

    I opted to assemble the steering as per step 10 using a heated blade to ‘squish’ down the tops of the pins on each side of the tie bar (D8) so I could turn both wheels together before gluing them in position. The steering rod connection to the driver’s side hub bar is a strange one. The instructions in step 10 and the diagram in step 11 both show it as attached from below, but it interferes with the tie bar this way! I simply attached it from above.

    My wheels are turned to full lock and the linkages adjusted to suit
    Click image for larger version

Name:	20220926_234628.jpg
Views:	1
Size:	3.9 KB
ID:	1185246

    Step 12 has you connecting the roadwheel pairs. This includes the two idler pairs. Fit on mine was not the best due to the overside tab on one side. It kept forcing the pair apart. The tubular connection is nice and straight so its simpler to cut the tabs down or remove them all together. I then glued my idler wheels to their stub axles which I built up in step 8. These are engineered to slot into the back of the rearmost suspension arm plates and will be adjusted in or out to optimise the track sag.

    Depending on how you like to construct and paint the wheels will determine how you plan out adding the wheels in step 13. I like to paint my wheels separately, but the interlocking system of wheels makes this process a bit more involved. Leaving the inner and outermost wheels separate is usually the easiest option.

    The sprocket housings locate onto the chassis and part B40 on them locates into the gearbox pins behind the hole (we lined the gearbox up with) in the chassis.

    Click image for larger version

Name:	20220926_234641.jpg
Views:	1
Size:	3.4 KB
ID:	1185248

    Taking a break from cleaning up wheels I skipped to step 16 and looked at how I could rework the incorrect seat layout in the cab. Trumpeter have opted to add a single bench instead of a separated driver’s seat and added a cut-out on the passenger side. The back rest moulding (part WA3) is two evenly spaced cushions. Looking at Hilary Doyle’s scale drawings in Panzer Tracts No 22-4 both the bench and back cushions are two different sized seats. The driver’s side is smaller, and the back cushion is also a lot thicker. In addition, the drawings show a single enclosed battery box sat against the side panel on the driver’s side and not two exposed batteries side by side like the kit has!

    Click image for larger version

Name:	20220927_102600_resized.jpg
Views:	1
Size:	6.5 KB
ID:	1185250

    Using the existing back cushion moulding I cut a portion off one side and re-attached it to the other. Using the drawings, I split the one-piece bench into two and filled in the cut-out section. As for the metalwork underneath, I utilised part WB3 to extend the front panel, filled the void and used plastic card to replace the lip and panel top.

    I have yet to add plastic card to make the drivers back rest thicker, blend in the back cushion and the bench to simulate two separate cushions.

    Click image for larger version

Name:	20220927_010306.jpg
Views:	1
Size:	1.9 KB
ID:	1185249

    Comment

    • minitnkr
      • Apr 2018
      • 7564
      • Paul
      • Dayton, OH USA

      #32
      Excellent blog.

      Comment

      • Allen Dewire
        • Apr 2018
        • 4741
        • Allen
        • Bamberg

        #33
        Just did a quick ketchup Los and appreciate the extra "love" you're putting into this build. Correcting all the inaccuracies is time consuming, but well worth it in the end. Very nice and clean work Sir. Keep it coming...

        Prost
        Allen
        Life's to short to be a sheep...

        Comment

        • The Smythe Meister
          • Jan 2019
          • 6248

          #34
          Originally posted by minitnkr
          Excellent blog.
          Yep,it certainly is
          ..... It's like having a reference book on my phone!!
          Cracking stuff all round Los.
          Andy

          Comment

          • Guest

            #35
            Originally posted by Panzerwrecker
            The track wheel axles (parts B29) do not need to be glued in. They are a smooth friction fit even after ridding them of mould seams and give the bonus of articulating all the wheels if you wish. They most definitely won’t fall out so no real need to glue unless you must.
            For comparison: on the Dragon kit they’re a tight fit that I wouldn’t say articulates much, or at all. The axle arms are also a different design, looking like a single-piece forging without the discs that are in the Trumpeter version.

            Originally posted by Panzerwrecker
            Using the existing back cushion moulding I cut a portion off one side and re-attached it to the other. Using the drawings, I split the one-piece bench into two and filled in the cut-out section. As for the metalwork underneath, I utilised part WB3 to extend the front panel, filled the void and used plastic card to replace the lip and panel top.
            The driver’s seat cushion was also about twice as thick as the passengers’, with a cut-out in the vertical panel below the seats to accommodate this — see my stripped Sd.Kfz. 7 for what I consider a reasonable attempt at all of this (minus the cushions). Compared to the Dragon kit, at least that panel seems to be set at the right depth in your kit: slightly behind the front of the side walls, not flush with those as per Dragon. I do notice that an access panel is missing on the left front of that same panel, below the battery box.

            Comment

            • Panzerwrecker
              • Mar 2022
              • 578
              • Los
              • Wales, UK

              #36
              Originally posted by minitnkr
              Excellent blog.
              Cheers Paul
              Originally posted by Allen Dewire
              Just did a quick ketchup Los and appreciate the extra "love" you're putting into this build. Correcting all the inaccuracies is time consuming, but well worth it in the end. Very nice and clean work Sir. Keep it coming...

              Prost
              Allen
              Thanks Allen. Always a big fan of Terry Asley over on his PMMS site. His work made some tricky kits far more enjoyable to build and made some kits a total no go. Nothing worse than spending hours of pleasure at the bench only to have the instructions blow all your hard work out of the water by spitting in your face three pages later. I know many will read the instructions thoroughly through before starting and many will make notes, but it is not always obvious until you tuck into those sprues what you’re in for. Especially when the parts have absolutely no resemblance to the image on the CAD drawing. I'm always up for a challenge but you do have to wonder about some manufacturers research and kit engineering.

              Comment

              • Panzerwrecker
                • Mar 2022
                • 578
                • Los
                • Wales, UK

                #37
                Originally posted by The Smythe Meister
                Yep,it certainly is :smiling3:
                ..... It's like having a reference book on my phone!!
                Cracking stuff all round Los.
                Andy
                Appreciated Andy

                Comment

                • Panzerwrecker
                  • Mar 2022
                  • 578
                  • Los
                  • Wales, UK

                  #38
                  Originally posted by Jakko
                  For comparison: on the Dragon kit they’re a tight fit that I wouldn’t say articulates much, or at all. The axle arms are also a different design, looking like a single-piece forging without the discs that are in the Trumpeter version.


                  The driver’s seat cushion was also about twice as thick as the passengers’, with a cut-out in the vertical panel below the seats to accommodate this — see my stripped Sd.Kfz. 7 for what I consider a reasonable attempt at all of this (minus the cushions). Compared to the Dragon kit, at least that panel seems to be set at the right depth in your kit: slightly behind the front of the side walls, not flush with those as per Dragon. I do notice that an access panel is missing on the left front of that same panel, below the battery box.
                  Looking at the PT book I cannot find any clear pics of the axle arms on the KM11. This is what the drawings show. It also confirms the steering rod to the hub knuckle is attached above the tie rod
                  Click image for larger version

Name:	20220927_190744.jpg
Views:	1
Size:	7.6 KB
ID:	1185269

                  Thanks for the info on the seat. I will look back over your build log

                  Comment

                  • Guest

                    #39
                    Those drawings appear to show the Dragon version of the axles.

                    Comment

                    • Panzerwrecker
                      • Mar 2022
                      • 578
                      • Los
                      • Wales, UK

                      #40
                      Originally posted by Jakko
                      Those drawings appear to show the Dragon version of the axles.
                      They do don't they.

                      Comment

                      • Guest

                        #41
                        FWIW, so does the photo from an original manual on page 68 of Die Halbkettenfahrzeuge des deutschen Heeres. But since this will all be invisible unless you’re building a diorama in which an inner wheel is being changed, does it really matter?

                        Comment

                        • Panzerwrecker
                          • Mar 2022
                          • 578
                          • Los
                          • Wales, UK

                          #42
                          Originally posted by Jakko
                          FWIW, so does the photo from an original manual on page 68 of Die Halbkettenfahrzeuge des deutschen Heeres. But since this will all be invisible unless you’re building a diorama in which an inner wheel is being changed, does it really matter? :smiling3:
                          As you say, if not exposing the axle, then not one-bit TBH. It is interesting how different manufacturers manage to produce such different end results. All these museum resto vehicles really do muddy the waters somewhat.


                          One thing reading through the PT book on the 8T that I hadn't noticed before in period images, and no kit manufacturer has released to date, is: the first incarnation of the wooden bed (Holzpritsche) was attached to the original metalwork cab which had the cut off HL rounded track fenders. This was installed by the manufacturer Saurer in November 1943.

                          I notice both these images below show the late and reduced depth track fender. Dragon released the HL version with these fenders in kit#6794

                          That is a kit bash that I might attempt in the future

                          Click image for larger version

Name:	20220926_135509_resized.jpg
Views:	1
Size:	7.3 KB
ID:	1185280Click image for larger version

Name:	20220926_135527_resized.jpg
Views:	1
Size:	6.2 KB
ID:	1185281

                          Comment

                          • Guest

                            #43
                            Originally posted by Panzerwrecker
                            Just noticed I have mounted the external cable guide bracket on the rear panel upside down:rolling: What a numptie:upside:
                            Can't believe you make mistakes, must be the the instructions Los .

                            Congratulations on a most detailed thread and high quality photos .It's more like a technical publication.

                            Comment

                            • scottie3158
                              • Apr 2018
                              • 14241
                              • Paul
                              • Holbeach

                              #44
                              Very nice work and blog.

                              Comment

                              • Panzerwrecker
                                • Mar 2022
                                • 578
                                • Los
                                • Wales, UK

                                #45
                                Originally posted by John Race
                                Can't believe you make mistakes, must be the the instructions Los .

                                Congratulations on a most detailed thread and high quality photos .It's more like a technical publication.
                                Thanks John

                                I make plenty, way too frequently

                                Originally posted by scottie3158
                                Very nice work and blog.
                                Cheers Paul

                                Comment

                                Working...